Cooling installation for internal combustion engines, especially for the cylinder and cylinder head of internal combustion engines for aircraft

ABSTRACT

A cooling system for internal combustion engines, especially for the cylinders and the cylinder heads of internal combustion engines for aircrafts, in which the internal combustion engine is cooled by means of a cooling liquid, whereby two cooling installations are used which include cooling medium circulatory systems that are completely separate from one another and operate independently of one another; each including a pumping arrangement the cooling medium lines of both cooling installations are thereby connected with each cylinder and cylinder head of the internal combustion engine. One of the pumping arrangements is responsive to the temperature in the area of one of the cylinders and cylinder heads and to the temperature of the cooling medium line in the other installation.

United States Patent 191 "Piech'et a1. i

[4s] June. 11,. 1974 COOLING INSTALLATION FOR INTERNAL COMBUSTION ENGINES, ESPECIALLY FOR THE CYLINDER AND CYLINDER HEAD OFINTERNAL COMBUSTION ENGINES FOR AIRCRAFT [75] lnventors: Ferdinand Piech, Stuttgart-Nord;

Hans Mezger, Ludwigsburg. both of Germany [73] Assignee: Dr. -Ing. h.c.F. Porsche Kg,

Stuttgart-Zuffenhausen, Germany 22 Filed: Feb. 17, 1972 211 App]. No.: 227,037

[30] Foreign Application Priority'Data- Feb. 20. 1971 Germany 2108249 [52] US. Cl l23/4l.02, l23/4l.18, 123/41.28, g 123/4129, 165/107 [51] 'Int. Cl F01p 7/16 [58] Field of Search 123/.41.01, 41.28, 41.18, 123/4l.02, 41.74, 41.29, 41.79; 165/107 [56] References Cited UNITED STATES PATENTS 2,644,434 7/1953- Watkins ..123 /41.74x

2,715,394 8/1955 Humpola et a1. 123/41.0l

FOREIGN PATENTS OR APPLICATIONS 370,023 3/1919 Germany Primary Examiner-Charles J. Myhre Assistant Examiner-W. Rutledge, Jr. Attorney, Agent, or Firm-Craig & Antonelli 57 ABSTRACT A cooling system for internal combustion engines, especially for the cylinders and the cylinder heads of internal combustion engines for aircra'fts, in which the internal combustion engine is cooled by means of a coolingliquid, whereby two cooling installations are used which include cooling medium circulatory systems that are completely separate from one another and operate independently of one another; each including a pumping arrangementthe cooling medium lines of both cooling installations are thereby connected with each cylinder and cylinder head of the internal combustion engine. One of the pumping arrangements is responsive to the temperature in the area of one of the cylinders and cylinder heads and to the temperature of the cooling medium line ,in the other installation.

3 Claims, 2 Drawing Figures The present invention relates to a cooling system for internal combustion engines, especially for the cylinder and the cylinder head of internal combustion engines for aircrafts, in which the internal combustion engine is cooled by means of a cooling liquid.

Cooling installations of intemalcombustion engines must be so constructed that under every operating condition-of the internal combustion engine a completely satisfactory and adequate cooling thereof is assured.

It is already known to construct cooling installations of internal combustion engines in such a manner that the internal combustion engine is safely cooled also under aggravated operating conditions. Thus, a cooling installation of an-internal combustion engine is de-.

scribed in the German Patent No. 370,023 in which a cooling circulation separate from the circulation of the cylinder is provided for the cooling of the lubricant and of the auxiliary aggregates. This prior art installation includes two separately arranged coolers, to which a respective one of the-two circulatory systems is'coordinated. However, it is disadvantageous that this prior art installation is prone to operational troubles notwithstanding the separate circulatory systemsand does not possess a sufficiently highoperating safety for the internal combustion engine inclusive of the auxiliary aggregates. In case of failure of one circulation due to leakage in someplace or due to some other damage, the entire internal combustion engine is rendered inoperable since notwithstanding the separation of the cooling circulations the operating safety of the intemal combustion engine depends on the functioning of both cooling circulations. Similarly, it may lead to grave consequential damages if the failure or breakdown of one cooling circulation isnot noticed sufficiently timelyi The aim of the present invention, in contradistilnction thereto, resides in providing a cooling installation for internal combustion engines, especially for the cylinder and the cylinder head of liquid cooled internal co'mbustion engines for aircrafts, which assures a reliable cooling of an internal combustion engine under every operating condition thereof, even in case of eventual damages of the cooling medium lines or of the cooler.

The underlying problem is solved according to the present invention in that the cooling system is constituted by a first and by a second cooling installation whose cooling medium circulations are arranged separate from one another and operate independently of one another whereby the cooling medium lines of both cooling installations areconnected with each cylinderand cylinder head of the internal combustion engine. It is advantageous that each cylinder and cylinder head of the internal combustion engine is provided with several cooling medium channels or lines through which flow.

. 2 cooling medium of both" cooling installationsis set into circulation by pumps'in'terconnected into the cooling medium line and driven by'the internal combustion engine whereby at least one of the two pumps is controlled by the thermostats arranged within the area of the cylinder or cylinder head and in the cooling medium line of the adjacent cooling circulation.- The advantages achieved by the present invention essentially reside in that-owing to the described features an operationally reliable cooling system is obtained for internal combustion engines in which, even after failure of one of the cooling circulatory systems the cooling of the entire combustion engine remains preserved so that a safe operation is obtained, especially of internal combustion engines for aircrafts. Such an arrangement also produces a far-reachingly safe operation of internal combustion engines for high-power aircrafts in which the full power output of the internal combustion engine is required for short periods of time, without having to fear an overheating of the internal combustion engine. This is achieved in particularby the arrangement of the cooling medium channels or lines in the "cylinder and cylinder'head of the internal combustion engine. As a result of the alternate conduction of the cooling medium of the cooling installations through the cooling medium channels in'each of the cylinders and of the cylinder heads of the internal combustion engine, in case of a failure or breakdown of one cooling circulatory system the cooling of the internal combustion engine is completely maintained so that the internal combustion engine remains safely and fully operational in every operating condition. The separate arrangement of all cooling medium lines as well as of the coolers further increases the operating safety of the internal combustion engine. One attainsa rapid operating tempera ture of the internal combustion'engine by the control of at least one of the pumps forthe circulation of the cooling medium of one cooling circulatory system by thermostats ar'ranged within the area-of the cylinder or of the cylinder head and of the adjacent cooling medium line. Similarly, a far-reaching operational safety is achieved by this arrangement of thermostats so that even in case of failure of one of the two thermostats the cooling of internal combustion engine remains preserved by the two cooling circulatory systems.

These and further objects, features and advantages of the present invention will become more apparent from the following description when taken in connection with the accompanying drawing which shows, for purposes of illustration only, one embodiment in accordance with the present invention, wherein FIG. 1 is a schematic view of a cooling system for internal combustion engines in accordance with the present invention and,

FIG. '2 isa cross-sectional view through one of the cylinders of the internal combustion engine taken along line ll-Il of FIG. 1, which illustrates the arrangement of the cooling medium channels.

Referring now to the drawing wherein like reference numerals are used throughout the two views to designate like parts, the cooling-system essentially consists of one cooling installation generally designated by reference numeral 1.. and. of another cooling installation generally designated by reference numeral 2 which are arranged completely separate from one another and which include each a cooling circulation completely closed in itself. The cooling installations l and 2 each include a cooler or radiator 3 and 4, which are arlines 8 and 9 which are respectively connected with the cylinder 10 andthe cylinder head 11 of an internal combustion engine 12. Liquid pumps 13 and 14 are connected into the suction lines 6 and 7 of the cooling installations 1 and 2. The pumps 13 and 14 are driven by the internal combustion engine 12 whereby the pump 14 of the cooling installation 2 is adapted to be connected with the internal combustion engine drive byway of an electrically controlled coupling or clutch device 15 of conventional construction and not illustrated in detail. The coupling device 15 is selectively controlled and actuated by a thermostat 16 which is arranged within the area of the cylinder head 11, or by a further thermostat 17 which is inserted into the suction line 6 of the cooling installation 1. The thermostats 16 and 17 are connected with a battery by way of electric lines 18 and an ignition switch 19. The suction and'pressure lines 6, 7, 8 and 9 of the two cooling installations 1 and 2, which are connected with the cylinders 10' and the cylinder heads 11- of the internal combustion engine 12 lead from a cooling medium collecting space (not shown) of each cylinder 10 and cylinder head 11 to individual cooling medium channels 21 and 22, respectively, provided in the cylinder jacket of the cylinders ll) and of the cylinder headsll. The cooling medium channels 21 are connected with a cooling circulation of the cooling installations land the cooling medium channels 22 with the cooling circulation of the cooling installation 2 so that the cooling medium of each of the two cooling installations 1 and 2 flows through the cylinders 10 and the cylinder heads 11 independently of one another.

During starting of the internal combustion engine 12 by closing the ignition switch 19 and the subsequent starting thereof, the thermostat 16 and 17 are connected to the electric power source, supplied by the battery 20. Simultaneously; thepump 13 of the cooling installation 1 is driven by the internal combustion engine 12. The pump 13 now circulates the cooling medium of thecooling installation 1 and supplies the same by way of the cooler 3 and the pressure'line 8 to the .cooling medium channels 21 of the cylinder 10 and of the cylinder head 1 1. After passing through the cooling medium channels 21 the cooling medium is again returned by the pump 13 to the cooler 3 by way of the suction lines 6. Below a predetermined operating temperature of the internal combustion engine 12 or of the cooling'medium only the cooling installation 1 operates. The cooling installation 2 remains inoperable for such length of time until the engaging temperature of one of the two thermostats l6 and 17 adjusted to the predetermined temperature value is reached. When the operating temperature is reached, then the thermostat 16 closes a contact (not shownlwhereby the current from the battery 20 flows by way of the lines 18 to the electrically actuated coupling or clutch mechanism 15 whereby also the pump 14 of the cooling installation 2 is set into operation. As a result thereof, the cooling installation 2 is also utilized for the cooling of the internal combustion engine 12. The functioning of the cooling installation 2 is the same as that of the cooling installastallation 2 is thereby alwaysconducted through the cooling medium channels 22 of the cylinder 10 and of the cylinder head 11 of the internal combustion engine 12, which are arranged adjacent to the cooling medium channels 21 of the cooling installation 1. if, however, as a result of some damage the thermostat 16 should fail, then the pump 14 of the cooling installation 2 is set into operation by the thermostat 17 inserted into the suction line 6 of the cooling system 1.

An operationally reliable cooling installation is obtained by this arrangement in which, in case of eventual damages of the cooling installation 1 or 2 or of the control elements 15', 16 or 17 thereof, the cooling of the internal combustion engine 12 is still assured to a sufficient degree. Also incase of loss of cooling medium in one of the two cooling installations 1 or 2, a safe operation of the internal combustion engine can be'maintained so that one can dispense with an immediate interruption of the operation which is decisive in particution 1 and therefore does not need to be described further. However, the cooling medium of the cooling inlar with internal combustion engines of aircraftsl While we have shown and described only one embodiment in accordance with the present invention, it is understood that the same is not limited thereto but issusceptible of numerous changes and modifications as known to those skilled in the art and we therefore do not wish to be limited to the details shown and. de scribed herein but intend to cover allsuch changes and modifications as are encompassed by the scope of the appended claims. I

What we claim is:

1. A cooling system for internal combustion engines,

especially for. the cylinder and cylinder head means of internal combustion engines for aircraft,,in which the internal combustion engine is cooled by a cooling liquid, characterized in that the cooling system includes a first cooling installation'and' a second cooling installation, each having cooling medium circulatory means arranged separated from one another and operable in dependently of one another, said cooling medium circulatory means including cooling medium lines, the

cooling lines of both cooling installations being operatively connected with each cylinder and cylinder head means of the internal combustion engine, each cylinder means and cylinder headmeans of the internal combustion engine is provided with several cooling medium the cooling medium of the second cooling installation,

the cooling medium of each cooling installation is set into circulation by pump means connected in the cooling medium lines and driven by the internal combustion engine, at least one of the two pump means being controlled by thermostat means arranged within the area of one of the cylinder and cylinder head means and in the cooling medium line of the adjacent cooling circulatory means.

2. A cooling system for internal combustion engines, especially for the cylinder and cylinder head means of internal combustion engines for aircraft, in which the internal combustion engine is cooled by a cooling liquid, characterized in that the cooling system includes a first cooling installation and a second cooling installation, each having cooling medium circulatory means arranged separated from one another and'operable independently of one another, said cooling medium circulatory means including cooling medium lines, the cooling linesof both cooling installations being operatively connected with each cylinder and cylinder head means of the internal combustion engine, the cooling medium of each cooling installation is set into circulation by pump means connected in the cooling medium lines and driven by the internal combustion engine at least one of the two pump means being controlled by thermostat means arranged within the area of one of the cylinder and cylinder head means and in the cooloperatively connecting said thermostat means with said control means in such a manner that said one pump means is set into operation upon response of either thermostat means. 

1. A cooling system for internal combustion engines, especially for the cylinder and cylinder head means of internal combustion engines for aircraft, in which the internal combustion engine is cooled by a cooling liquid, characterized in that the cooling system includes a first cooling installation and a second cooling installation, each having cooling medium circulatory means arranged separated from one another and operable independently of one another, said cooling medium circulatory means including cooling medium lines, the cooling lines of both cooling installations being operatively connected with each cylinder and cylinder head means of the internal combustion engine, each cylinder means and cylinder head means of the internal combustion engine is provided with several cooling medium channel means which are traversed by separate cooling medium flows, the cooling medium of both cooling installations flows through the cooling medium channel means of the cylinder means and cylinder head means of the internal combustion engine in such a manner that a portion of the cooling medium channel means is traversed by cooling medium of the first cooling installation and adjacent cooling medium channel means by the cooling medium of the second cooling installation, the cooling medium of each cooling installation is set into circulation by pump means connected in the cooling medium lines and driven by the internal combustion engine, at least one of the two pump means being controlled by thermostat means arranged within the area of one of the cylinder and cylinder head means and in the cooling medium line of the adjacent cooling circulatory means.
 2. A cooling system for internal combustion engines, especially for the cylinder and cylinder head means of internal combustion engines for aircraft, in which the internal combustion engine is cooled by a cooling liquid, characterized in that the cooling system includes a first cooling installation and a second cooling installation, each having cooling medium circulatory means arranged separated from one another and operable independently of one another, said cooling medium circulatory means including cooling medium lines, the cooling lines of both cooling installations being operatively connected with each cylinder and cylinder head means of the internal combustion engine, the cooling medium of each cooling installation is set into circulation by pump means connected in the cooling medium lines and driven by the internal comBustion engine at least one of the two pump means being controlled by thermostat means arranged within the area of one of the cylinder and cylinder head means and in the cooling medium line of the adjacent cooling circulatory means.
 3. A cooling system according to claim 2, characterized by control means for controlling the operation of at least said one pump means, and connecting means operatively connecting said thermostat means with said control means in such a manner that said one pump means is set into operation upon response of either thermostat means. 